Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Theory Of Operation
The purpose of this diagnostic is to check the electrical performance of the input speed sensor circuit. The sensor is located in front of the target wheel which is connected to the transmission input shaft, and measures the rotation of the target wheel. The input speed sensor is a Hall Effect sensor with a pulse train output frequency range of 50 ~ 8000 RPM. The normal operating output voltage range of the input speed sensor is in the range of 0.8 to 1.5 V. The malfunction conditions detected by this diagnostic include short to battery, short to ground, and open circuit failures. These malfunctions are determined based upon the A/D conversion value.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.